-LRB- CNN -RRB- -- Whoever killed six people in a Memphis , Tennessee , home may still be on the loose , police said Tuesday . They asked the community for help in solving the slayings .

Police and fire units responded Monday after six people were killed in Memphis , Tennessee .

Police found six people -- two men , two women and two boys -- dead in a home in a north Memphis neighborhood Monday , said Memphis police Lt. Joe Scott .

Three other children who were wounded in the home were taken to a hospital .

Scott did not release the names of the victims . He said there was no sign of forced entry into the home , and evidence at the scene indicated that the killer or killers left the house .

Detectives were trying to determine the day of the killings , which could have occurred as early as Saturday , Scott said .

He said police had not developed a suspect and need people to come forward with information .

`` We need the community 's help , '' he said . `` These were children that were brutally killed . We know that there are people out there that heard things , saw something . This is a stain on our community . We really need the community 's help to solve this . ''

The four dead adults were shot and the two dead children were stabbed , sources told CNN affiliate WMC-TV .

The wounded children -- a 7-year-old boy , a 10-month-old girl and a 4-year-old whose gender was n't immediately known -- were transported to Le Bonheur Children 's Medical Center . They were treated for gunshot wounds , said hospital spokeswoman Jennilyn Utkov , who said she did not have any additional information about their conditions .

At least one of the wounded children also was stabbed , police told the Commercial Appeal newspaper . The newspaper reported Tuesday that two of them were in very critical condition and one was in serious condition .

A neighbor told CNN Tuesday that he heard gunshots coming from the house Saturday night .

`` I heard about six or seven shots , '' said Wayne Bolden , a landscaper who said he lives across the street from the home where the killings occurred . `` I did not call the police because you always hear shooting in this neighborhood . Now I wish I would have called . ''

He said he did not see any movement at the home the next day . The two cars , a van and a passenger car , never moved .

Monday , he saw many police cars at the home and heard about the killings , he said .

Bolden said a family that included a man , a woman and five or six children moved into the home about five months ago .

`` I did not know him by name , '' Bolden said of the man . `` But the kids were always out playing , and he would barbecue outside on his front porch . ''

A prayer service was held for the victims Tuesday morning at the family 's nearby church , said Keith Norman , senior pastor at First Baptist Church .

He said he had been asked by the police to counsel the family members of the victims . Another prayer service was scheduled for 6 p.m. , he said , and some of the victims ' family members are expected to attend .

`` There are multiple families affected by this , '' said Norman , who said he did not want to speak about what led to the killings . `` We are just praying for the family members and trying to help them get through this . ''

Police do not know what was behind the violence , the Commercial Appeal newspaper reported .

`` We just do n't know the motive or cause of death , but we do have four adults and two children -LSB- dead -RSB- , '' Memphis police Lt. Jerry Guin told the paper .

Rob Robinson told the Commercial Appeal that he was the landlord for the brick , single-family house that rented for $ 550 per month .

`` They were very nice , very polite to me , '' Robinson told the paper of the residents .

`` It 's kind of surprising , actually . I 've never had any trouble with them , no damage to the property . They paid their rent and even helped with repairs and stuff . ''

Neighbor Leo Baker told WMC-TV he has lived nearby for 10 years but did not know the residents of the home .

`` It 's sad you come home to find out something like this has gone on , '' Baker said . `` It 's kind of sad , and scary too . ''

Video footage showed emergency vehicles on the scene , with people embracing in rainy weather outside police tape surrounding the home .

`` I 've been on a scene where there were one or two or three -LSB- victims -RSB- , but I do n't remember anything this large , '' Guin told the Commercial Appeal .

The newspaper reported that the shooting appeared to be the city 's deadliest mass killing since 1973 , when 28-year-old David Sanders randomly shot and killed five people before being shot dead by police .

In 2000 , police said firefighter Frederick Williams confessed to a shooting in Memphis in which four people were killed -- his wife , a sheriff 's deputy and two fellow firefighters . E-mail to a friend

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NEW : Police believe killer or killers left the Memphis house where 6 people slain

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Neighbor says he heard shots Saturday night , did n't call police

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Police : Four adults , two kids killed ; 3 other children wounded

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7-year-old , 4-year-old , and 10-month-old hospitalized